Thus all the possible combinations of the factors that make the product of two squares are the following:1² × 20² = 4002² × 10² = 4004² × 5² = 400

There are three possible pairs that fit the criterion. The correct answer is D.---------The answer should be E. 4 , because your explanation has missed the possibility of 20² × 20² . It is not mentioned that the numbers should be distinct.

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